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High-temperature Oxidation
High-temperature oxidation refers to a scale-forming oxidation process involving a metallic object and atmospheric oxygen that produces corrosion at elevated temperatures. High-temperature oxidation is a kind of High-temperature corrosion High-temperature corrosion is a mechanism of corrosion that takes place when gas turbines, diesel engines, furnaces or other machinery come in contact with hot gas containing certain contaminants. Fuel sometimes contains vanadium compounds or sul .... Other kinds of high-temperature corrosion include high-temperature sulfidation and carbonization. High temperature oxidation and other corrosion types are commonly modelled using the Deal-Grove model to account for diffusion and reaction processes. Mechanism of oxidation High temperature oxidation is generally occurs via the following chemical reaction between oxygen (O2) and a metal M: nM + 1/2kO2 = MnOk According to Wagner's theory of oxidation, oxidation rate is controlled by partial ionic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-temperature Corrosion
High-temperature corrosion is a mechanism of corrosion that takes place when gas turbines, diesel engines, furnaces or other machinery come in contact with hot gas containing certain contaminants. Fuel sometimes contains vanadium compounds or sulfates, which can form low melting point compounds during combustion. These liquid melted salts are strongly corrosive to stainless steel and other alloys normally resistant with respect to corrosion at high temperatures. Other types of high-temperature corrosion include high-temperature oxidation, sulfidation, and carbonization. High temperature oxidation and other corrosion types are commonly modeled using the Deal-Grove model to account for diffusion and reaction dynamics. Sulfates Two types of sulfate-induced hot corrosion are generally distinguished: Type I takes place above the melting point of sodium sulfate, whereas Type II occurs below the melting point of sodium sulfate but in the presence of small amounts of SO3. In Type I, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
